Fire-fighting equipment, namely, aerial fire-fighting equipment; agricultural equipment, namely, equipment affixed to aircraft for watering, applying fertilizers, applying herbicides, applying fungicides, applying pesticides and applying insecticides; insect and pest control equipment, namely, equipment affixed to aircraft for applying insect control materials and pest control materials; and cleaning equipment, namely, equipment affixed to aircraft for applying materials to clean power generation equipment and structures, power storage equipment and structures and power transmission equipment and structures